There is no one single answer to your question. Two 6-volt batteries in series will give you 12 volts. CCA will depend on the size of the batteries used in this configuration. CCA will not add, but will be equal to the lesser of the two batteries if they are not the same size. ' Two 12-volt batteries in parallel will still be 12 volts, but the CCA will be equal to the sum of the two batteries used. So, two BIG 6-volt batteries CAN be better than 2 smaller 12-volt batteries. But, in general, the 2 12-volt batteries will probably be better simply because they will be higher capacity. The real answer is to look at the sizes and ratings of the batteries in question. The preferred setup would be the ones with the higher capacity CCA.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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